KING OF PRUSSIA, Pa.--(BUSINESS WIRE)--Trevena, Inc., the leader in the discovery and development of G-protein coupled receptor (GPCR) biased ligands, today announced the initiation of a research collaboration with Merck, through a subsidiary. The collaboration will focus on screening for biased ligands against an undisclosed receptor using Trevena’s proprietary assays and know-how. Financial details of the collaboration have not been disclosed.